As a former phone tech, I can add a few things to this that will help: 1) Avoid apps that constantly update. They reach out for new data every few minutes, which not only uses up more battery power, but chews through your data allotment faster. 2) Turn off the bluetooth if you're not using it, otherwise the bluetooth feature will constantly search for a device, using more power. 3) Download an app-killer. They can be found all over the place for free. When you open apps on your smartphone and "close" them again, they aren't REALLY closed. They're just running in the background, like a minimized program on a computer, so they're still using power (and data, in some cases.) App-killers close them completely. The app is still there, you just have to restart it if you want to use it again. Small price to pay for better battery life and lower data usage. 4) Shut off the "locato...